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Value of Business Acquired, Deferred Acquisition Costs and Deferred Sales Inducements - Narrative (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
VOBA
Finite-Lived Intangible Assets [Line Items]
Adjustment for net unrealized investment gains	$ (298)	$ (101)
VOBA | Minimum
Finite-Lived Intangible Assets [Line Items]
Interest accrual rate utilized to calculate accretion of interest	0.00%
VOBA | Maximum
Finite-Lived Intangible Assets [Line Items]
Interest accrual rate utilized to calculate accretion of interest	4.71%
DAC
Finite-Lived Intangible Assets [Line Items]
Adjustment for net unrealized investment gains	$ (53)	(8)
Deferred sales inducement, unrealized investment gains	$ (10)	$ (2)

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